Looking at your setup, I can make some suggestions from experience.
1. Leave a screen door so you can access under the coop without having to go in the run and climb under.
2. I'm in florida so the sun here gets extreme. They need shade. I put wire on top of the run to deter Hawks ect, but...
Your chickens, your call. But the layer feed is researched and tested to be the correct ratio for a layer chicken - not meat bird. That's a different rato. Is there something you don't like in the layer feed? Or are you just a naturalist? I don't care to go through the extra work myself when...